#define _CRT_SECURE_NO_WARNINGS
#include<stdio.h>
int main()
{
	unsigned int m, t, s;
	scanf("%d%d%d", &m, &t, &s);
	double eat = 1.0 * s / t;
	if (t == 0||eat>=m) printf("0\n");
	else
	{
		int temp = eat;
		if (s % t == 0) printf("%d\n", m - temp);
		else printf("%d\n", m - temp - 1);
		
	}
	return 0;
}